September should see the second reading in Parliment of an amendment to the Energy Bill, which could add a clause requiring commercial premises to have Display Energy Certificates (DECs). This legislation could take effect by 2013 or even earlier.

Buildings are estimated to account for 40% of energy use, but the government has no detailed information on exactly how much energy commercial buildings in the UK actually use. The roll out of DECs would provide an avenue for the government to access detailed statistical data showing exactly where and how energy is being used.

We don't yet know which buildings will be covered by the legislation, many authorities are pushing for all commercial buildings to be included, however big or small. It is more likely though that this will be a staged process and only large, energy intensive buildings will be included in the first phase.

DECs were introduced in October 2008, but currently they are only required for public buildings larger than 1,000m2. The very nature of the certificates means they must be displayed in a prominent place within the building and can be commonly seen in the reception areas of government buildings, museums, schools and libraries.

DECs are produced using actual energy data, which is where they differ from the more widespread Energy Performance Certificates (EPCs) and as such give a picture of the 'in-use' energy use and efficiency of the building.

DECs must be renewed on an annual basis to encourage continual improvement and energy efficiency enhancement.

Carbon Green Consulting Limited would like to see the role out of DECs to all commercial buildings, not only would this provide a focus for building owners and occupiers for reducing their energy use and making improvements to the buildings themselves, but will also provide valuable data to the government agencies to assist with developing future policy, and shaping the methodology for the refurbishment of our existing building stock.